using System;
using System.IO;
using System.Text;

namespace Vinno.vCloud.Disk
{
    public static class FileHelper
    {
        /// <summary>
        /// 写文件
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="contexts"></param>
        /// <param name="encodingStr"></param>
        public static void WriteFile(string fileName, string contexts, string encodingStr = "UTF-8")
        {
            try
            {
                if (!string.IsNullOrEmpty(fileName))
                {
                    using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.ReadWrite))
                    {
                        Encoding textEncoding = Encoding.GetEncoding(encodingStr.ToUpper());
                        using (StreamWriter streamWriter = new StreamWriter(fs, textEncoding))
                        {
                            streamWriter.Write(contexts);
                        }
                    }
                }
            }
            catch
            {
                // ignored
            }
        }

        /// <summary>
        /// 追加文件信息
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="contexts"></param>
        /// <param name="encodingStr"></param>
        public static void AppendWriteFile(string fileName, string contexts, string encodingStr = "UTF-8")
        {
            try
            {
                if (!string.IsNullOrEmpty(fileName))
                {
                    using (FileStream fs = new FileStream(fileName, FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
                    {
                        Encoding textEncoding = Encoding.GetEncoding(encodingStr.ToUpper());
                        using (StreamWriter streamWriter = new StreamWriter(fs, textEncoding))
                        {
                            if (!contexts.EndsWith("\r\n"))
                            {
                                streamWriter.Write(contexts + "\r\n");
                            }
                            else
                            {
                                streamWriter.Write(contexts);
                            }
                        }
                    }
                }
            }
            catch
            {
                // ignored
            }
        }

        /// <summary>
        /// 读取文件内容
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="encodingStr"></param>
        /// <returns></returns>
        public static string ReaderFile(string fileName, string encodingStr = "UTF-8")
        {
            try
            {
                if (File.Exists(fileName))
                {
                    using (var fileStream = File.OpenRead(fileName))
                    {
                        using (StreamReader reader = new StreamReader(fileStream, Encoding.GetEncoding(encodingStr)))
                        {
                            if (reader.Peek() != -1)//防止读不完全问题
                            {
                                string txtline = reader.ReadToEnd();
                                return txtline;
                            }
                        }
                    }
                }
            }
            catch
            {
                // ignored
            }

            return string.Empty;
        }

        /// <summary>
        /// 拷贝文件夹
        /// </summary>
        /// <param name="srcFolder"></param>
        /// <param name="targetFolder"></param>
        public static void CopyFiles(string srcFolder, string targetFolder, Action<int> progressCallback = null)
        {
            Directory.CreateDirectory(targetFolder);
            int finishFileCount = 0;
            var files = Directory.GetFiles(srcFolder);
            foreach (var file in files)
            {
                File.Copy(file, file.Replace(srcFolder, targetFolder), true);
                finishFileCount++;
                progressCallback?.Invoke((int)(finishFileCount / (double)files.Length * 99));
            }
            var dirs = Directory.GetDirectories(srcFolder);
            foreach (var dir in dirs)
            {
                CopyFiles(dir, dir.Replace(srcFolder, targetFolder));
            }
            progressCallback?.Invoke(100);
        }
    }
}